Boiler plant



L.'W. MENDELL.

fgolLEn PLANT. APPLICAUUN FILED oc. '3, |916. l

l 1,334,548. n Patented Mar.23,1920.

2 SHEETS--SHEET l.

L. W. MENDELL.

BOILER PLANT.

APPLICATION FILED ocT. 3. 1915.

g PatenteaMar. 23,1920.

2 SHEETS-SHEET 2.

LESTER W. MENDELL, 0F BROOKLYN, NEW YORK, ASSIGNOR TO LAWRENCE BARNUM AND JAMES Jl. MLDON, RUTH. F NEW YORK, N. Y.

l BOILEB, PLANT.

Application filed (lctcber 3, 1916.

To all whom t may concern:

Be it known that I, Lns'rnn W. Mnwnnnn, a citizen of the United States, residing` at Brooklyn, in the county of Kings, State of New York, `have invented certain new and useful Improvements in Boiler Plants, of which the following1 is a full, clear, and exact description..

My invention relates to boiler plantsand has for `its object to produce a boiler plant provided with means for substantially preventing,` the lormation and discharge of black smoke during the (sealingl period when soft coal `or any fuel is used. It further has for its object to provide suchia plant with means for producing within the furnace substantially complete combustion for the products discharged from the stack. lt further has for its object to provide means for securing the' above results in water tube boiler plants and increasing their efficiency.

The following; is a description of an einbodiment of my invention, reference being;` had to the accompanying` drawings, i in whichi Figure 1 shows a transverse section of the plant on the line 1--1 2, looking1 `toward the front.

Fig. 2 is a longitudinal section on the line 2 2 Fig. 1. i

Referring` more particularly to the draw-` ings, 1 is the ordinary brlckworlr support of the boiler having the coalinp; doors 2-2 and the ash doors 3-3 and the lgrate 4l. in the fire-box. 5` are the tubes of an ordinary water tube boiler, there being` the ordinary upwardly extending: wall 6 and baflle17, the downwardly extending1 baffle 8, the headers 9 and 10 and the drum 11 connected at points 12 and 13 to the respective headers. 141-. is the stack for discharging the products of combustion. These features are those in common use in water tube boiler plants.

in order to embody my invention in its preferred forni. I provide a colrinp; arch 15 located below the forward elevated end of the water tubes 5. said archconstituting an upper wall for the fire-box.- and leaving; a space in front of the rear wall 6 for the passage of the .products of combustion among); the boiler tubes and around the baflies 7 and S to the stack 14.- and at the rear of said arch provide two steam discharge openings 16S- likte which lead pipes 17 17 which are connected. through valves .1d-18 with the Specification of Letters Patent.

Patented illiar. 23, 1920.

Serial No. 123,485.

larger pipes 1.9-19 which are connected to the main steam pipe 20 preferably through a valve 21. l: also introduce localized abutn ments 22 one on each side of the drinn 1l above the baille 7 so as t-o slightly throttle the passage for the products of combustion and retard their progress to the stack. l have found that the discharge mouths of the openings 16-16 are preferably flattened s o `as to be about an inch in width and one quarter of an inch in height so as to spread the steam passing therethrough` l have also found that the pipes 17 17 may be made with a diameter of about one half inch, while if the pipes 19-19 are made of a diameter of one inch, satisfactory results will be produced. By making the pipes 19 and 19 relatively large, there is no substantial reduction in the pressure between the main pipe 20 and the pipes 17 and 17 when steam is being; discharged. The pipes 17 and 17 preferably disch arpje in a slightly downward direction, as shown in Fin'. 1, so that the eX- tended axes of said nozzles lil-16 and the streams ofstearn discharged therefrom are along lines removed from the lower surface ofthe central tcp portion of the arch, so as not to interfere with the passage of gases from along' such surface to the stach. The cokinpg arch 15 also is preferably` provided with a space 23 at its front end, which per- `mits the gases of a flare hach7 to be drawn.

up more or less at that point and pass to the stack. eliminating); the danger of having a flare back come through the charging doors 2-2 when open.

The axes of applioants nozzles lie substantially-in a transverse vertical plane located at the rear of the fire-bon and also lie .in longitudinally extending planes which form an angle well below the under surface of cokinp; arch so that steam issuing` from the nozzles does not block the passage of the frases from the central portion of such un der surface. The nozzles extend through the side walls at points adjacent to the horizontal plane `passing` through the uppermost rear portion of the under surface of said colring arch. As shown, the nozzles do not extend into the fire-box any considerable distance and are therefore protected by the side walls against the heat within the lire. boX.

In the operation of this plant, the fire is started in the ordinary manner and when once started the coking arch 15 becomes highly heated so as to tend to produce complete combustion of the gases produced within the furnace under normal working conditions. When it is desired to coal, the valves 18-18 being open, so as to permit the free passage of the desired amormt of steam, the -valve 21 is opened, whereupon steam rushes down through the pipes 17 and 17 into the fire-box over the rear portion of the grate, fillingl this portion of the box with steam without materially interfering with the passage of the gases from the upper portion of the lire-box to the stack. The steam as it passes through the hot walls is somewhat. superheated before it is discharged from the nozzle-s. The soft coal is then introduced 1n the ordinary manner, and the highly heated gasesrcoming from beneath the colnng arch mtc contact with the volatilized or partiallyY volatilized portions of the fresh coal and mingling therewith in the presence of the injected steam, such portions are vso completely consumed that as they pass to the stack and are discharged therefrom, substantially noblacl smoke is visible.

The carbon, which in the ordinary water tube boiler-plant would be discharged in the form of smoke, is so consumed as to produce substantially invisible products of combustion and affords heat units which are utilized in heating the boiler. After the coaling has been completed and the freshly introduced coal Vhas been ignited to such a` degree that it would not give olf smoke under ordinary conditions, the valve 21 is closed and permitted tovremain closed .until it is time toi begin the next coaling operation, whereupon the steps above referred to are again repeated. j

As will be evident to those skilled in the art, my invention permits of various modifiy cations without'departing from the spirit thereof or the scope of the appended claims.

What I claim is: 1.v In ahoiler. plant, the combination of a *.boiler, a setting for the same provided with a irebox, a stack, a colring arch located below the forward portion of said boiler and leaving at the rear of said lire-hex an upwardly extending passage betweenI said col;- ing arch and the rear wall of said fire-box for the discharge of the products of coml bustion, with a `nozzle located in a substan-V tially transverse vertical plane at the rear of said firebox and pointing in a downwardly inclineddirection toward the rear yco portion ofsaid fire-box from one side of said lire-box, the axis of said nozzle passeV ingV below the level of the central portion of the lower surface of said arch so that theY stream of discharged steam does notinterfere with the freeV passage of gases from the lower surface of the central portion of said arch to said stack.

-leaving at the rear of said {ire-box an upwardly extending passage between said coke ing arch and the rear wall of said {ire-box for the discharge of the products of combustion, the opposite side walls of said setting each having a port located in a vertical plane adjacent to the rear of said lire-box, and means for discharging steam in downwardly inclined directions into the rear of said fire-box through said ports, the axes of the discharging means passing below the level of the central portion of the lower surface of said arch so that the streams of discharged steam do not interfere with a free passage ofgases from the lower surface of the central portion of said arch to said stack.

3. In a boiler plant, the combination of a boiler, a setting for the same provided with a fire-box, a stack, a coking arch located below the forward portion of said boiler and leaving at the rear of said fire-box an up- Vwardly extending passage between said coking arch and the rear wall of said lire-box lfor the discharge of the products of combustion, a nozzle adjacent to the rear of said lire-box and pointing inwardly toward the rear lower portion of said nre-box, the extended axis of said nozzle within said firebox being below the level of the lower surface of the central top portion of said arch so that the stream of discharged steam does not interfere with a free passage of gases from the lower surface of the top portion of said arch to said stack, and means for supplying steam to said nozzle.

4. In a boiler plant, the combination of a boiler, a setting for the same provided with a fire-box, a stack, a coking arch located below the forward portion of said boiler and leaving at the rear of said lire-box an upwardly extending passage between said coking arch and the rear wall of said fire-box for the discharge of the products of combustion, nozzles located on opposite sides of said fire-box adjacent to the rear of said lire-box and pointing downwardly toward rear portions thereof, extended axes of said nozzles being removed from the lower surface of the central top'portion of said arch so that the streams of steam discharged from said nozzles form an angle well below the level of the under surface of said arch and do not interfere with the free passage of gases from the lower surface of the top portion of said arch to said stack, and means for supplying steam to said nozzles.

5. In a boiler plant, the combination of a boiler, a setting for the same provided with leaving at the rear of said lire-box an upwardly extending passage between said coking arch and the rear Wall of said fire-box for the discharge of the products of com- 5 hustion, nozzles located adjacent to the rear 10 angle and having their intersection Well heloW the level of the central portion of the under surface of said arch so that streams of discharged steam do not interfere With a free passage of gases from the lower surface of the top portion of said arch to said stack, means for supplying steam to said nozzles, and means for controlling the discharge of steam therethrough.

LESTER W. MENDELL. 

